Berlin 2024 – scientific programme

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MA: Fachverband Magnetismus

MA 46: Poster II

MA 46.53: Poster

Thursday, March 21, 2024, 15:00–18:00, Poster C

Magnetization-dependent electronic structure and ultrafast electron dynamics in CrGeTe3 — •Túlio de Castro¹, Tommaso Pincelli², Lawson Lloyd¹, Maciej Dendzik¹, Shuo Dong¹, Samuel Beaulieu¹, Ralph Ernstorfer², and Laurenz Rettig¹ — ¹Fritz-Haber-Intitüt, Berlin — ²Technische Universität, Berlin.

2D magnets present new possibilities to develop sizable and versatile nanodevices that work by manipulating the spin current, making it more efficient than charge-based devices. One of these promising 2D magnets is CrGeTe₃ (CGT) with a Curie temperature of ≈ 65K. Besides the magnetic order, the dimensionality allows us to study heterostructures with other 2D materials and make use of magnetic proximity effects. Here, we study bulk crystals of CGT using angle-resolved photoemission spectroscopy (ARPES) and femtosecond time-resolved ARPES (trARPES) to understand the magnetic-order induced changes to the electron distribution and the exchange splitting dynamics at different temperatures. By comparing data at the ASTRID synchrotron with data from our trARPES setup, we discuss the temperature-dependent band structure modifications and their ultrafast dynamics in bulk CGT. We further discuss the implication of our results for thin layers, monolayers, and heterostructures.

Keywords: CGT; Magnetism; two-dimensional; Spins; Dynamics